Senior Mechanical Engineer – Data Centres

ZeroOne; Leinster; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Pension contribution

Direct mentorship from Directors

Certification support

Job summary

ZeroOne is seeking a hands-on Senior Mechanical Engineer to lead the design and delivery of complex cooling systems for Europe‑wide data centre projects. You will mentor Intermediate and Graduate engineers and shape technical standards within a growing consultancy.

You will report to the Associate Mechanical Engineer and work in a hybrid Dublin setting, collaborating with the Mechanical Director to influence project direction.

Qualifications

• Degree in Mechanical Engineering or Building Services required.
• 5+ years of mechanical design experience, preferably in data centre projects.
• Chartered Engineer status or progression towards chartership is desirable.

Responsibilities

• Lead detailed mechanical design of HVAC, chilled water, CRAC/CRAH, and related cooling systems.
• Prepare specifications, calculations, schematics, and project reports.
• Review junior engineer outputs and ensure technical excellence.
• Manage day‑to‑day delivery of mechanical packages and coordinate with teams.
• Coordinate with electrical teams for fully integrated M&E design; attend client/site meetings.
• Provide coaching to Intermediate and Graduate engineers.

Skills

Mechanical design

Team mentoring

Project coordination

Problem solving

Communication

Education

Bachelor's degree in Mechanical Engineering or Building Services Engineering

Tools

AutoCAD

Revit

Bluebeam

P&ID software

Job description

This is a key role within our Dublin Core Team, acting as a technical pillar for our mechanical design delivery. You will report to the Associate Engineer and work directly with the founding Mechanical Director, offering you unrivalled mentorship and a genuine influence on project direction.

You will be a hands-on engineer, taking ownership of the design and delivery of complex cooling systems for a wide range of data centre projects. Our portfolio includes fast-paced data hall fit-outs, complex refurbishments, and large-scale new builds for colocation and hyperscale clients.

This role is perfect for a technically-driven engineer who thrives on solving complex problems and wants to take a significant step in their career. You will not just be a number; you will be a foundational member of the team, helping to mentor our Intermediate and Graduate engineers and shaping the technical standards of a new, ambitious consultancy.

Location

Dublin, Ireland (Hybrid)

Reports to: Associate Mechanical Engineer / Mechanical Director.

Key Responsibilities

Design & Delivery

• Produce and lead the detailed design of mechanical systems, including HVAC, chilled water, CRAC/CRAH, ventilation, and other critical cooling solutions.

Technical Production

• Prepare and review technical specifications, calculations, schematics (P&IDs), and project reports.

Quality Assurance

• Act as a key reviewer, checking calculations, drawings, and reports produced by junior engineers and the remote Flex Team to ensure technical excellence.

Project Management

• Manage the day-to-day delivery of mechanical packages, coordinating resource and activities to ensure projects are delivered on time and to budget; report regularly to the Associate/Director on project performance.

M&E Coordination

• Work proactively with the electrical team to ensure a fully coordinated, clash-free, and efficient M&E design, upholding ZeroOne DC's One Team Culture.
• Attend and actively participate in client, project, and site meetings, representing ZeroOne DC as a technical expert; undertake site visits to monitor installation progress against the design specification.
• Provide technical guidance, training, and day-to-day coaching to Intermediate and Graduate engineers, playing a key role in their professional development.

About You

• Experience: 5+ years of experience in a mechanical engineering design role, ideally within a consultancy environment.
• Qualifications: Degree qualified (or equivalent) in Mechanical Engineering or Building Services Engineering.
• Technical Expertise: Proven technical competence in designing complex mechanical systems (HVAC, chilled water, etc.). Direct data centre experience is a significant advantage, but strong candidates from other high-tech, industrial, or critical environments will be considered.
• Chartership: Actively working towards, or having already achieved, Chartered Engineer (CEng) status with CIBSE, Engineers Ireland, or equivalent.
• Software Skills: Proficiency in AutoCAD and Revit, with a working knowledge of Bluebeam and mechanical design/calculation software.
• Standards: A strong understanding of CIBSE, ASHRAE, and relevant European (EN/IS) standards.
• Soft Skills: Excellent communication skills, a collaborative mindset, and the ability to manage your own workload and that of others in a fast-paced, agile environment.
• Applicants must have the legal right to live and work in the European Union and be able to provide evidence of their work authorization if requested.

Preferred Certifications

• Chartered Engineer (CEng) with CIBSE, Engineers Ireland, or equivalent, or actively working towards.

Preferred

• Experience working on projects across the EMEA region.
• Site-based experience, including witnessing commissioning (Cx).
• Familiarity with emerging cooling technologies and sustainability strategies.

Remuneration

Remuneration will be competitive and will be set in line with the successful candidate's level of experience, reflecting current market benchmarks for specialist data centre engineering talent in Europe.

• Competitive salary, reflective of experience and market benchmarks
• Pension contribution
• Direct mentorship from ZeroOne's founding Directors
• Structured support toward relevant professional certification (e.g., Chartered Engineer, MRICS, PMP/Prince2, CIPS)
• Travel and expenses covered for client-site visits across Europe

About ZeroOne

ZeroOne is a specialist MEP Design Solutions Company focused exclusively on the European Data Centre sector. Founded by industry leaders who have collectively delivered over 2GW of Data Centre capacity across the EMEA region, we combine deep technical expertise with an agile, client-focused approach. We are headquartered in Dublin and have a simple mission: to be the benchmark and most trusted name in MEP Design Solutions in the European Data Centre industry by delivering exceptional, sustainable, and highly efficient designs.

Our innovative Core & Flex delivery model combines a highly experienced Ireland-based core team with a scalable network of specialist engineering professionals across the industry. This approach allows us to deliver technical excellence, remain responsive to client needs, and support some of the industry's most demanding projects.

At ZeroOne, we are building a culture centred on Technical Excellence, Agility, Client Partnership, and One Team Collaboration, creating an environment where talented engineers can make a real impact.

Why Join ZeroOne?

1. Learn from Industry Leaders

Work directly with founding directors who have delivered some of the largest and most complex data centre projects across Europe. Gain hands‑on mentorship and accelerate your professional development.

2. Shape the Future of a Growing Business

Join at an exciting stage of our journey and play a meaningful role in building a next‑generation consultancy. Your ideas, expertise, and contributions will directly influence our success.

3. Work on Market‑Leading Data Centre Projects

Support the delivery of cutting‑edge projects for major colocation and hyperscale clients across Europe, helping to shape the digital infrastructure of tomorrow.

4. Enjoy Genuine Flexibility with Competitive Remuneration

Our business is designed around modern working practices, offering a flexible hybrid model that promotes autonomy, collaboration, and work‑life balance.

5. Be Part of a High‑Performance, People‑First Culture

Join a team that values trust, accountability, inclusion, and teamwork. We celebrate individual contributions, support personal growth, and succeed together as one team.